Valve



(No Model) G. T. WLSON.

4 VALVE. 310.359,94). Patented Mar. 22, 1887.

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UNITED STArEs PATENT Ormes,

GEORGE T. VILSON, OF BOSTON, ASSIGNOR OE OSE-HALE TO JULIAN DESTE, OFSALEM, MASSACHUSETTS.

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SPECIFICATION forming part'of Letters Patent No. 359,949, dated March22, 1887.

Application filed Januarv 8, 1887.

To alla/hom it may concern..-

Be it known that I, GEORGE T. VILSON, of Boston, in the county ofASuffolk and State of Massachusetts, have invented a new and usefulImprovement in Valves, of which the following is a specication.

The object of the invention is to provide a valve apparatus to regulatethe passage of vaporous and gaseous substances, especially steam, soarranged that, first, such a substance may pass through the valveseat tothe outletpipe until the back pressure it exerts has reached the maximumpressure it is intended it should exert and tends to rise above it, andthat then it should cease to pass through, and, that, second, such asubstance may not pass through the valve-seat to the outlet until itexerts the maximum pressure it is intended that it should exert, andthat it should cease to pass through when the pressure it exerts is lessthan 'the maximum back -pressure intended. 4

In my invention the valve-seat has a prolongation provided with a portor ports, preferably the latter, around which the main valve titstightly. The prolongation of the valveseat is further provided with avalve -seat valve.

To attain the object of my invention above 'numbered first,77 saidvalve-seat valve is kept open by a force equal to the maximum pressureit is intended that the backA pressure should exert, in order that steammay pass through the prolongation of the valve-seat to the inner area ofthe main valve and raise said main valve and open said ports to thepassage of steam, the valve-seat valveclosing when it is relieved ofsaid force, allowing thereby the valve-closing spring to close said mainvalve and shut said ports to the passage of steam.

To attain the object of my invention above numbered second, saidvalve-seat valve is kept closed by a force equal to the maximumpressure-high pressure-it is i ntended should be exerted, said valveseatvalve opening when relieved of said force, in order that steam may passthrough the prolongation of the valve` seat to the inner area of themain valve, and raise said main valve against the pressure of thevalve-olosing spring and open said ports to the passage of steam.

In the drawings, Figure l represents a seetional elevation of anapparatus embodying my invention, arranged to attain the object ot' myinvention above numbered lirst7 Fig. 2 represents a sectional elevationof a modilieation of the apparatus shown in Fig. l, arranged to serveasa relief-valve to attain the object of my invention above numberedseeond.77

In Fig. 1, C is the valve case, which has the inlet A and outlet B'. Thevalve seat T' has the prolongation G', which is provided with the portsP', and is also provided with the valve-seat valve n, as shown. Thevalve-stem r of this valve 'u passes through the opening M in theprolongation of the valve-seat, and passes loosely through the valve V'to admit of a slight leakage of steam to avoid formingy temporarily acushion when the valve V' closes,

and is provided with a nut, n, and carries a spring, s, as shown. Theprolongation Ghas the packing-grooves w w. s is the valve-clos ingspring, com pressed bet-Ween the valvecase cap K' and the shoulder 71-of the valve V' when the valve V' is raised. The valve-case cap K hasthe perforationsf for the passage of steam to the diaphragm D. The coverU screws to l the valve-case C' and contains the spring S',

through which passes the rod It'. This rod It' is provided with the diskQ, against which the spring S bears when the compressingnut N', whichturns in the cover II', is turned against the spring S', compressingsaid spring, and causing the disk Q, to bear through the diaphragm Dupon the nut n of the valve-stem r, and thereby open the valve-seatvalve o.

The operation is as follows: The compressing-nut Ejis turned against thespring S', and the spring compressed thereby sufficiently to resist apressure not greater than the maxi-l mum pressure intended. The springS', by means of the disk Q, bears through the dia 4phragm D upon thevalve-stem r, and forces said valve-stem down against the lifting forceof the spring s, opening thereby the valve-seat valver. Steam entersthrough the inlet A into the prolongation Gr' of the valve-seat, passesthrough the opening M, and presses against the inner area, L', of thevalve V',

and lifts this valve V against the pressure of the valve-closing springs', opening thereby the ports l of the valve-seat, through which steampasses to the outlet B. The steam also ills the valve-case Cl and,passes through the perforations f in the valvecase cap K', and pressesagainst the diaphragm D. The steam, pressing against the diaphragm D,when it exerts the maximum pressure intended and tendsV to rise aboveit, forces up the disk Q and spring S, and thereby relieves thevalve-stem 1 of the pressure upon it. The spring s then raises thevalve-stem i', closing thereby the valve-seat valve t, and the spring scloses the main valve V around the ports P-steam in the valve V leakingout, as above eXplained-- and shuts off the passage of steam through thevalve'seat, the main valve Vrernaining closed so long as the pressure ofsteam-back-presst valve 'v2 is seated over` the opening h 2 in the`valve-seat prolongation of the apparatus shown in Fig. 2,instead of,asin Fig. l, passing through the opening M of that gurc.

The operation is as follows: Theconipress ing-nut N2 is turned againstthe spring S2, and the spring compressed sufficiently thereby to resistapressure not greater than the maximum pressure intended. The spring S2,by means of the disk Q2, bears through the diaphragm D2 upon thevalve-stem r2, and forces said valve-stem down against the lifting forceof the spring s2, seating the valve-seat valve` o2 over the opening M2ofthe prolongation G2 of the valveseat, and keeping said opening closed.

Steam enters through the inlet A2, and passf ing through theperforationsf2 in the valve-` case cap K2presses against the diaphragmD2; The steam,pressing against the diaphragm D?, when it exerts themaximum `pressure intended and tends to rise above it,t`orces up thedisk Q2 and thesprin g S2, andtherehy relieves thevalvestem r2 of thepressure upon itl. The spring s2 then `raises the valve-stem r2 andlifts the valve-seat va1vev2 from its seat over the opening M2. Steamthen passes through this opening M2 and presses against the inner area,L2, of the main Valve V, and lifts this valveV2 against the pressure ofthe `valve-closing spring s3, opening thereby the ports P2 of thevalveseat prolongation,` through which steam escapes to the outlet B2until the pressureof steam upon the diaphragm D2 is less than themaximum pressure intended, when the spring S2, by means of the disk Q2,bears through the diaphragm D2 upon the valve-stem r2, and

forces said valve-stem down and seats the valve-seat valve t2 over theopening M2, elosing said opening and shutting off the passage of i steamto the inner area, L2, ofthe main valve V2. The valve-closing spring s3then closes the 'valve V2 around the ports P2, shutting off the escapeof steam to the outlet B2, the l small. opening x inthe main valve V2admitting ofla slight leakage of steam to avoid forming temporarily acushion when the valve Vz closes.

I claim- In a valve apparatus, the combination of a main valve, mainvalve-closing spring, valveseathaving a prolongation provided with a.port or ports, and a valve-seat valve operatedT substantially as setforth, substantially as descrihed, for the purpose specified.

GEORGE T. NVILSON.

\Vitnesses:

VVALDRON BATES, JULIAN DEsT.

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